Malicious PDF — malware analysis report

Static analysis result for SHA-256 989049ddba63c961…

MALICIOUS

PDF

89.9 KB Created: 2021-02-28 13:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 658e8b337b4a88d1e83541b5a551b2a9 SHA-1: 136a6aa9313a787df8cef6bf1099005b98b7ddb6 SHA-256: 989049ddba63c96158f5de2f29f961ee630c9d92b9e8df1650ce706a86f90163
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute traffic to malicious sites. One of the embedded URLs, https://yafferge.ru/wix?keyword=sas+substr+function+from+right, is identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=sas+substr+function+from+right In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_5fe91c32833c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_602f17aa5de60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413243/normal_5fdf186f1ff93.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/2dcfe7c9b9979.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/zuzexibuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff963dc8b8c3.pdfIn PDF document text
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/e8171b40.pdfIn PDF document text
    • https://cdn.sqhk.co/jeviseme/dYjcGor/56378735256.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/remington_700_bdl_30_06_synthetic_stock_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_60274de5745b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6039652d46d40.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/nelibajafobinulovovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajulugebimisu.myartsonline.com/how_to_replace_belt_and_rollers_on_maytag_dryer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 5504 bytes
SHA-256: 63e256b677057da1dd1f85b7ed74eb2c72a8fe35f0552ff51395cb7b82c888eb
font_01_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 15796 bytes
SHA-256: 3e2d058ae3f1410207515234d88ea8698b7e5aa6fd847e460ccf17c8e5170657

Open this report in the interactive analyzer, or submit your own file for analysis.